CN115094412B - Manufacturing process of high-pressure-resistant stainless steel connecting pipe flange - Google Patents
Manufacturing process of high-pressure-resistant stainless steel connecting pipe flange Download PDFInfo
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- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 73
- 239000010935 stainless steel Substances 0.000 title claims abstract description 73
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- 239000011248 coating agent Substances 0.000 claims abstract description 53
- 238000000576 coating method Methods 0.000 claims abstract description 53
- 238000001132 ultrasonic dispersion Methods 0.000 claims abstract description 50
- 239000000843 powder Substances 0.000 claims abstract description 43
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 39
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 36
- 229910052582 BN Inorganic materials 0.000 claims abstract description 34
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims abstract description 34
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000000835 fiber Substances 0.000 claims abstract description 23
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims abstract description 20
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims abstract description 20
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims abstract description 20
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 12
- 238000005253 cladding Methods 0.000 claims abstract description 8
- 238000001035 drying Methods 0.000 claims abstract 2
- 239000000243 solution Substances 0.000 claims description 87
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 60
- 238000006243 chemical reaction Methods 0.000 claims description 54
- 238000003756 stirring Methods 0.000 claims description 43
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 39
- 239000002244 precipitate Substances 0.000 claims description 33
- 239000008367 deionised water Substances 0.000 claims description 30
- 229910021641 deionized water Inorganic materials 0.000 claims description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 30
- 238000000498 ball milling Methods 0.000 claims description 28
- 239000005457 ice water Substances 0.000 claims description 22
- 239000012286 potassium permanganate Substances 0.000 claims description 22
- 238000000034 method Methods 0.000 claims description 21
- 238000001291 vacuum drying Methods 0.000 claims description 20
- 239000000463 material Substances 0.000 claims description 19
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 16
- 230000008569 process Effects 0.000 claims description 16
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 11
- 238000004108 freeze drying Methods 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 11
- QLOAVXSYZAJECW-UHFFFAOYSA-N methane;molecular fluorine Chemical compound C.FF QLOAVXSYZAJECW-UHFFFAOYSA-N 0.000 claims description 11
- 239000011259 mixed solution Substances 0.000 claims description 11
- 230000007935 neutral effect Effects 0.000 claims description 11
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 11
- NWZSZGALRFJKBT-KNIFDHDWSA-N (2s)-2,6-diaminohexanoic acid;(2s)-2-hydroxybutanedioic acid Chemical compound OC(=O)[C@@H](O)CC(O)=O.NCCCC[C@H](N)C(O)=O NWZSZGALRFJKBT-KNIFDHDWSA-N 0.000 claims description 10
- 239000002202 Polyethylene glycol Substances 0.000 claims description 10
- 229910045601 alloy Inorganic materials 0.000 claims description 10
- 239000000956 alloy Substances 0.000 claims description 10
- 238000000227 grinding Methods 0.000 claims description 10
- IKDUDTNKRLTJSI-UHFFFAOYSA-N hydrazine monohydrate Substances O.NN IKDUDTNKRLTJSI-UHFFFAOYSA-N 0.000 claims description 10
- LGQLOGILCSXPEA-UHFFFAOYSA-L nickel sulfate Chemical compound [Ni+2].[O-]S([O-])(=O)=O LGQLOGILCSXPEA-UHFFFAOYSA-L 0.000 claims description 10
- 229910000363 nickel(II) sulfate Inorganic materials 0.000 claims description 10
- 229920001223 polyethylene glycol Polymers 0.000 claims description 10
- 238000005245 sintering Methods 0.000 claims description 10
- 238000005406 washing Methods 0.000 claims description 10
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims 1
- 238000007789 sealing Methods 0.000 abstract description 11
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 18
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 18
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 18
- 239000002245 particle Substances 0.000 description 16
- 230000000052 comparative effect Effects 0.000 description 13
- 238000004140 cleaning Methods 0.000 description 9
- 238000005054 agglomeration Methods 0.000 description 8
- 230000002776 aggregation Effects 0.000 description 8
- 239000011812 mixed powder Substances 0.000 description 8
- 238000002156 mixing Methods 0.000 description 8
- 239000012071 phase Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 238000005336 cracking Methods 0.000 description 4
- 230000008021 deposition Effects 0.000 description 4
- 238000009826 distribution Methods 0.000 description 4
- 229910021389 graphene Inorganic materials 0.000 description 4
- 239000000126 substance Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 239000002270 dispersing agent Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 150000002430 hydrocarbons Chemical group 0.000 description 2
- 238000004372 laser cladding Methods 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 239000007790 solid phase Substances 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 239000010963 304 stainless steel Substances 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000007767 bonding agent Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 150000001721 carbon Chemical group 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 238000005121 nitriding Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000009210 therapy by ultrasound Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C24/00—Coating starting from inorganic powder
- C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
- C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
- C23C24/103—Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
- B22F1/107—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material containing organic material comprising solvents, e.g. for slip casting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/14—Treatment of metallic powder
- B22F1/145—Chemical treatment, e.g. passivation or decarburisation
- B22F1/147—Making a dispersion
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/16—Making metallic powder or suspensions thereof using chemical processes
- B22F9/18—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds
- B22F9/24—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds starting from liquid metal compounds, e.g. solutions
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B21/00—Nitrogen; Compounds thereof
- C01B21/06—Binary compounds of nitrogen with metals, with silicon, or with boron, or with carbon, i.e. nitrides; Compounds of nitrogen with more than one metal, silicon or boron
- C01B21/064—Binary compounds of nitrogen with metals, with silicon, or with boron, or with carbon, i.e. nitrides; Compounds of nitrogen with more than one metal, silicon or boron with boron
- C01B21/0648—After-treatment, e.g. grinding, purification
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/15—Nano-sized carbon materials
- C01B32/182—Graphene
- C01B32/184—Preparation
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Engineering & Computer Science (AREA)
- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Dispersion Chemistry (AREA)
- Nanotechnology (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
- Powder Metallurgy (AREA)
Abstract
The invention discloses a manufacturing process of a high-pressure-resistant stainless steel connecting pipe flange. Adding polycrystalline cubic boron nitride, modified Ni powder, fluorinated graphene and polyvinylpyrrolidone into absolute ethyl alcohol, and performing ultrasonic dispersion to prepare a high-pressure-resistant coating solution. And uniformly coating the high-pressure-resistant coating solution on the surface of the stainless steel connecting pipe flange, drying, placing in a transparent sealing box filled with nitrogen, and cladding by using an IPG fiber laser system to obtain the high-pressure-resistant stainless steel connecting pipe flange.
Description
Technical Field
The invention relates to the technical field of stainless steel connecting pipe flanges, in particular to a manufacturing process of a high-pressure-resistant stainless steel connecting pipe flange.
Background
Stainless steel pipe connecting flanges in a pipeline connecting system are widely used in practical application production as important component parts in the system. It can be used in boiler pressure vessel, petroleum, chemical industry, shipbuilding, pharmacy, metallurgy, machinery, food and other industries, and is convenient for replacing a certain section of pipeline. With the progress of the times, the scientific technology is rapidly developed, and the requirements on the stainless steel connecting pipe flange are further improved. The stainless steel connecting pipe flange has the characteristics of high pressure resistance, high temperature resistance, corrosion resistance and the like. In the production process, accidents causing serious consequences are often caused by failure or leakage of the flange of the stainless steel connecting pipe, which not only brings great economic loss to actual production, but also has serious social influence. At present, the problems of accidents caused by more researches on flange leakage, flange sealing and other fields and less researches on reasons of the flange are mainly solved. Also, with the ever changing production demands, conventional standard flanges are difficult to accommodate.
Therefore, the high-pressure-resistant stainless steel connecting pipe flange has important significance.
Disclosure of Invention
The invention aims to provide a manufacturing process of a high-pressure-resistant stainless steel connecting pipe flange, which aims to solve the problems in the background technology.
In order to solve the technical problems, the invention provides the following technical proposal
In the invention, the material of the stainless steel connecting pipe flange is S31603 austenitic stainless steel, which is based on molybdenum, and has higher corrosion resistance, ductility, compressive strength and high temperature resistance compared with the conventional stainless steel such as 304 stainless steel.
A manufacturing process of a high-pressure-resistant stainless steel connecting pipe flange comprises the following steps:
S1: pretreating the surface of a stainless steel connecting pipe flange for later use;
S2: the high-pressure resistant coating solution is coated on the surface of the stainless steel bar connecting pipe flange, dried, and deposited by an IPG fiber laser system under the protection of nitrogen, so as to obtain the high-pressure resistant stainless steel connecting pipe flange.
Further, in the step S2, the high pressure resistant coating solution component includes: polycrystalline cubic boron nitride, modified Ni powder, fluorinated graphene, polyvinylpyrrolidone and absolute ethyl alcohol.
Further, each component of the high-pressure-resistant coating solution comprises, per 100 parts, 4-12 parts of polycrystalline cubic boron nitride, 18-22 parts of modified Ni powder, 5-6 parts of fluorinated graphene, 1-2 parts of polyvinylpyrrolidone and the balance of absolute ethyl alcohol.
Further, in the step S2, the high pressure resistant coating solution is prepared as follows: adding polycrystalline cubic boron nitride, modified Ni powder, fluorinated graphene and polyvinylpyrrolidone into absolute ethyl alcohol, and performing ultrasonic dispersion.
Further, the ultrasonic dispersion temperature is 75-80 ℃, the ultrasonic dispersion power is 220-240W, and the ultrasonic dispersion is repeated three times at intervals of 3min for 10 min.
Further, the polycrystalline cubic boron nitride is prepared according to the following method: adding 75% of cBN powder, 17% of TiN powder and 8% of aluminum powder into a hard alloy ball milling tank, and taking absolute ethyl alcohol as a ball milling medium, wherein the ball material mass ratio is 4:1, grinding, vacuum drying, and sintering for 10min at the pressure of 5.5GPa and the temperature of 1500 ℃.
Further, the modified Ni powder is prepared according to the following method: adding 8mL of polyethylene glycol into 100mL of nickel sulfate solution with the concentration of 0.05mol/L, and uniformly stirring; adding 100mL of hydrazine hydrate solution with the concentration of 0.125mol/L and 100mL of sodium hydroxide solution with the concentration of 0.175mol/L, carrying out ultrasonic reaction, and adjusting the pH value by using sodium hydroxide in the reaction process, and keeping the pH value unchanged until the reaction is finished; centrifuging, washing with absolute ethanol and deionized water for three times, and vacuum drying.
Further, the fluorinated graphene is prepared according to the following method: adding 0.5g of graphite fluoride into 120mL of concentrated sulfuric acid in a state of ice water bath at 0-2 ℃, uniformly stirring, adding 6g of potassium permanganate three times, stirring for 30min at a time interval of 10min, slowly heating the ice water bath at 0-2 ℃ to 50 ℃, and stirring for reaction; after the reaction is finished, removing unreacted complete potassium permanganate, regulating the mixed solution to be neutral, centrifuging, collecting precipitate, placing the precipitate into deionized water, centrifuging after ultrasonic dispersion, removing the precipitate, and freeze-drying the solution.
Further, the laser frequency of the IPG fiber laser system is 50kHz, the laser power is 80W, the diameter of a light spot is 0.8mm, the scanning speed is 2mm/s, and the scanning interval is 0.25mm.
Compared with the prior art, the invention has the following beneficial effects: according to the invention, polyvinylpyrrolidone is added in ultrasonic dispersion, so that the polyvinylpyrrolidone has a longer hydrocarbon chain structure, can be adsorbed on the surface of powder to have a dispersion effect, greatly enhances the rejection performance among particles, and can be used as a dispersing agent to enhance the electric double layer rejection, hydration film effect and steric hindrance rejection, thereby effectively solving the problems of uneven distribution of each component in the high-pressure-resistant coating solution and poor high-pressure-resistant performance of the coating caused by mutual aggregation among particles.
The invention replaces the traditional cubic boron nitride with the polycrystalline cubic boron nitride, and has stronger high-pressure resistance and wear resistance. The aluminum powder is used as a bonding agent, and is in a molten state in a high-temperature and ultrahigh-pressure state, so that the diffusion flow of cBN and TiN particles and the bonding and reaction among the particles are facilitated. The TiN can flow in the pores of the internal structure and fill the pores among the cBN particles, so that the binding force between the TiN and the cBN is enhanced, and the compactness of the polycrystalline cubic boron nitride is effectively improved. The TiN powder can also make up the problem of lower hardness of AlN and AlB 2 generated in the reaction process.
The modified Ni powder is used for replacing the traditional Ni powder, has better dispersibility, and can avoid the occurrence of agglomeration. The problems that the fluorinated graphene and the polycrystalline cubic boron nitride cannot be completely and uniformly dispersed in a Ni aggregate, so that the high-pressure resistance of each part of the surface is different, and the effect and leakage are easy to occur in actual production are solved.
According to the invention, the fluorinated graphene is used for replacing the traditional graphene, so that the graphene has lower surface energy and stronger hydrophobicity, and also has better high temperature resistance, high pressure resistance and stable chemical property. The traditional graphene has low melting point, high carbon atom activity and high diffusion speed, and is easy to diffuse and dissolve in a high-temperature and high-pressure environment, so that the high-pressure resistance of the surface coating is reduced.
In the laser cladding process, as the lap joint cladding track is continuously generated on the surface of the stainless steel connecting pipe flange by laser, the solidification speed is delayed by the high temperature resistance of the fluorinated graphene, the mutual solution balance of liquid phase and solid phase in the cladding system is improved, the coating stress concentration in the cladding system is reduced, and the formation of coating cracks is further inhibited.
The addition of TiN and Al in the polycrystalline cubic boron nitride enriches the phases in a deposition system, and TiC, tiB, ti 2 Ni and alpha-Ti are additionally contained in the deposition system. The TiC is used as a hard phase to coat the fluorinated graphene particles, so that a lubricating phase in the coating can be effectively increased, and in the high-pressure extrusion process, the TiC can form a drag and drag effect on the fluorinated graphene, so that the phenomenon of cracking of the coating caused by collective falling of the fluorinated graphene from the coating is prevented; meanwhile, tiC and Ti 2 Ni form a composite structural phase which is staggered and grows in an adhering way, so that Ti 2 Ni tissues can be thinned, the distribution uniformity of the Ti 2 Ni tissues is improved, the occurrence of agglomeration phenomenon is avoided, the cracking sensitivity of the coating is reduced, the stability under high pressure is facilitated, and the fluctuation of the mechanical property of the coating is reduced.
The invention controls the power and interval of ultrasonic dispersion in the high-pressure resistant coating solution, can solve the problem of agglomeration phenomenon of particles due to high temperature and high pressure generated in the ultrasonic process, and has better dispersibility.
Detailed Description
The following description of the technical solutions in the embodiments of the present invention will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
S1: cleaning the surface of the stainless steel connecting pipe flange with acetone for later use;
S2: adding 75% of cBN powder, 17% of TiN powder and 8% of aluminum powder into a hard alloy ball milling tank, and taking absolute ethyl alcohol as a ball milling medium, wherein the ball material mass ratio is 4:1, grinding and mixing materials for 6 hours, wherein the ball milling rotating speed is 300r/min, and vacuum drying for 8 hours at 100 ℃; and sintering the mixed powder for 10min at the pressure of 5.5GPa and the temperature of 1500 ℃ to obtain the polycrystalline cubic boron nitride.
S3: adding 8mL of polyethylene glycol into 100mL of nickel sulfate solution with the concentration of 0.05mol/L, and uniformly stirring; adding 100mL of hydrazine hydrate solution with the concentration of 0.125mol/L and 100mL of sodium hydroxide solution with the concentration of 0.175mol/L, carrying out ultrasonic reaction, and adjusting the pH value by using sodium hydroxide in the reaction process, and keeping the pH value unchanged until the reaction is finished; and (3) centrifuging, washing with absolute ethyl alcohol and deionized water for three times, and vacuum drying at 60 ℃ for 6 hours to obtain modified Ni powder.
S4: adding 0.5g of graphite fluoride into 120mL of concentrated sulfuric acid in an ice water bath state, uniformly stirring, adding 6g of potassium permanganate three times at intervals of 10min, slowly heating the ice water bath to 50 ℃ after stirring for 30min, and stirring for reaction for 8h; after the reaction is finished, adding hydrogen peroxide to remove unreacted complete potassium permanganate, and adding 10mL of 5% hydrochloric acid solution; adjusting the mixed solution to be neutral by deionized water, centrifuging at 5000r/min for 20min, collecting precipitate, placing the precipitate in deionized water, ultrasonically dispersing for 10min, centrifuging at 10000r/min for 1h, removing the precipitate, and freeze-drying the solution to obtain the fluorinated graphene.
S5: 4 parts of polycrystalline cubic boron nitride, 22 parts of modified Ni powder, 6 parts of fluorinated graphene and 1 part of polyvinylpyrrolidone are added into absolute ethyl alcohol, and the high-pressure-resistant coating solution is obtained through ultrasonic dispersion. Wherein the ultrasonic dispersion temperature is 80 ℃, the ultrasonic dispersion power is 240W, and the ultrasonic dispersion is repeated three times at intervals of 3min for 10 min.
S6: the high-pressure resistant coating solution is uniformly coated on the surface of the stainless steel bar connecting pipe flange, dried, placed in a transparent sealing box filled with nitrogen, and deposited by an IPG fiber laser system to obtain the high-pressure resistant stainless steel connecting pipe flange. The IPG fiber laser system has the laser frequency of 50kHz, the laser power of 80W, the spot diameter of 0.8mm, the scanning speed of 2mm/s and the scanning interval of 0.25mm.
And (3) testing: the Nano mechanical properties of the high pressure resistant stainless steel adapter flange were tested using an Agilent Nano INDENTER G Nano indenter, see table 1.
Example 2
S1: cleaning the surface of the stainless steel connecting pipe flange with acetone for later use;
S2: adding 75% of cBN powder, 17% of TiN powder and 8% of aluminum powder into a hard alloy ball milling tank, and taking absolute ethyl alcohol as a ball milling medium, wherein the ball material mass ratio is 4:1, grinding and mixing materials for 6 hours, wherein the ball milling rotating speed is 300r/min, and vacuum drying for 8 hours at 100 ℃; and sintering the mixed powder for 10min at the pressure of 5.5GPa and the temperature of 1500 ℃ to obtain the polycrystalline cubic boron nitride.
S3: adding 8mL of polyethylene glycol into 100mL of nickel sulfate solution with the concentration of 0.05mol/L, and uniformly stirring; adding 100mL of hydrazine hydrate solution with the concentration of 0.125mol/L and 100mL of sodium hydroxide solution with the concentration of 0.175mol/L, carrying out ultrasonic reaction, and adjusting the pH value by using sodium hydroxide in the reaction process, and keeping the pH value unchanged until the reaction is finished; and (3) centrifuging, washing with absolute ethyl alcohol and deionized water for three times, and vacuum drying at 60 ℃ for 6 hours to obtain modified Ni powder.
S4: adding 0.5g of graphite fluoride into 120mL of concentrated sulfuric acid in an ice water bath state, uniformly stirring, adding 6g of potassium permanganate three times at intervals of 10min, slowly heating the ice water bath to 50 ℃ after stirring for 30min, and stirring for reaction for 8h; after the reaction is finished, adding hydrogen peroxide to remove unreacted complete potassium permanganate, and adding 10mL of 5% hydrochloric acid solution; adjusting the mixed solution to be neutral by deionized water, centrifuging at 5000r/min for 20min, collecting precipitate, placing the precipitate in deionized water, ultrasonically dispersing for 10min, centrifuging at 10000r/min for 1h, removing the precipitate, and freeze-drying the solution to obtain the fluorinated graphene.
S5: 8 parts of polycrystalline cubic boron nitride, 22 parts of modified Ni powder, 6 parts of fluorinated graphene and 1 part of polyvinylpyrrolidone are added into absolute ethyl alcohol, and the high-pressure-resistant coating solution is obtained through ultrasonic dispersion. Wherein the ultrasonic dispersion temperature is 80 ℃, the ultrasonic dispersion power is 240W, and the ultrasonic dispersion is repeated three times at intervals of 3min for 10 min.
S6: the high-pressure resistant coating solution is uniformly coated on the surface of the stainless steel bar connecting pipe flange, dried, placed in a transparent sealing box filled with nitrogen, and deposited by an IPG fiber laser system to obtain the high-pressure resistant stainless steel connecting pipe flange. The IPG fiber laser system has the laser frequency of 50kHz, the laser power of 80W, the spot diameter of 0.8mm, the scanning speed of 2mm/s and the scanning interval of 0.25mm.
And (3) testing: the Nano mechanical properties of the high pressure resistant stainless steel adapter flange were tested using an Agilent Nano INDENTER G Nano indenter, see table 1.
Example 3
S1: cleaning the surface of the stainless steel connecting pipe flange with acetone for later use;
S2: adding 75% of cBN powder, 17% of TiN powder and 8% of aluminum powder into a hard alloy ball milling tank, and taking absolute ethyl alcohol as a ball milling medium, wherein the ball material mass ratio is 4:1, grinding and mixing materials for 6 hours, wherein the ball milling rotating speed is 300r/min, and vacuum drying for 8 hours at 100 ℃; and sintering the mixed powder for 10min at the pressure of 5.5GPa and the temperature of 1500 ℃ to obtain the polycrystalline cubic boron nitride.
S3: adding 8mL of polyethylene glycol into 100mL of nickel sulfate solution with the concentration of 0.05mol/L, and uniformly stirring; adding 100mL of hydrazine hydrate solution with the concentration of 0.125mol/L and 100mL of sodium hydroxide solution with the concentration of 0.175mol/L, carrying out ultrasonic reaction, and adjusting the pH value by using sodium hydroxide in the reaction process, and keeping the pH value unchanged until the reaction is finished; and (3) centrifuging, washing with absolute ethyl alcohol and deionized water for three times, and vacuum drying at 60 ℃ for 6 hours to obtain modified Ni powder.
S4: adding 0.5g of graphite fluoride into 120mL of concentrated sulfuric acid in an ice water bath state, uniformly stirring, adding 6g of potassium permanganate three times at intervals of 10min, slowly heating the ice water bath to 50 ℃ after stirring for 30min, and stirring for reaction for 8h; after the reaction is finished, adding hydrogen peroxide to remove unreacted complete potassium permanganate, and adding 10mL of 5% hydrochloric acid solution; adjusting the mixed solution to be neutral by deionized water, centrifuging at 5000r/min for 20min, collecting precipitate, placing the precipitate in deionized water, ultrasonically dispersing for 10min, centrifuging at 10000r/min for 1h, removing the precipitate, and freeze-drying the solution to obtain the fluorinated graphene.
S5: 8 parts of polycrystalline cubic boron nitride, 22 parts of modified Ni powder, 6 parts of fluorinated graphene and 1 part of polyvinylpyrrolidone are added into absolute ethyl alcohol, and the high-pressure-resistant coating solution is obtained through ultrasonic dispersion. Wherein the ultrasonic dispersion temperature is 80 ℃, the ultrasonic dispersion power is 240W, and the ultrasonic dispersion is repeated three times at intervals of 3min for 10 min.
S6: the high-pressure resistant coating solution is uniformly coated on the surface of the stainless steel bar connecting pipe flange, dried, placed in a transparent sealing box filled with nitrogen, and deposited by an IPG fiber laser system to obtain the high-pressure resistant stainless steel connecting pipe flange. The IPG fiber laser system has the laser frequency of 50kHz, the laser power of 80W, the spot diameter of 0.8mm, the scanning speed of 2mm/s and the scanning interval of 0.25mm.
And (3) testing: the Nano mechanical properties of the high pressure resistant stainless steel adapter flange were tested using an Agilent Nano INDENTER G Nano indenter, see table 1.
Comparative example 1
S1: cleaning the surface of the stainless steel connecting pipe flange with acetone for later use;
S2: adding 8mL of polyethylene glycol into 100mL of nickel sulfate solution with the concentration of 0.05mol/L, and uniformly stirring; adding 100mL of hydrazine hydrate solution with the concentration of 0.125mol/L and 100mL of sodium hydroxide solution with the concentration of 0.175mol/L, carrying out ultrasonic reaction, and adjusting the pH value by using sodium hydroxide in the reaction process, and keeping the pH value unchanged until the reaction is finished; and (3) centrifuging, washing with absolute ethyl alcohol and deionized water for three times, and vacuum drying at 60 ℃ for 6 hours to obtain modified Ni powder.
S3: adding 0.5g of graphite fluoride into 120mL of concentrated sulfuric acid in an ice water bath state, uniformly stirring, adding 6g of potassium permanganate three times at intervals of 10min, slowly heating the ice water bath to 50 ℃ after stirring for 30min, and stirring for reaction for 8h; after the reaction is finished, adding hydrogen peroxide to remove unreacted complete potassium permanganate, and adding 10mL of 5% hydrochloric acid solution; adjusting the mixed solution to be neutral by deionized water, centrifuging at 5000r/min for 20min, collecting precipitate, placing the precipitate in deionized water, ultrasonically dispersing for 10min, centrifuging at 10000r/min for 1h, removing the precipitate, and freeze-drying the solution to obtain the fluorinated graphene.
S4: 12 parts of polycrystalline cubic boron nitride, 22 parts of modified Ni powder, 6 parts of fluorinated graphene and 1 part of polyvinylpyrrolidone are added into absolute ethyl alcohol, and the high-pressure-resistant coating solution is obtained through ultrasonic dispersion. Wherein the ultrasonic dispersion temperature is 80 ℃, the ultrasonic dispersion power is 240W, and the ultrasonic dispersion is repeated three times at intervals of 3min for 10 min.
S5: the high-pressure resistant coating solution is uniformly coated on the surface of the stainless steel bar connecting pipe flange, dried, placed in a transparent sealing box filled with nitrogen, and deposited by an IPG fiber laser system to obtain the high-pressure resistant stainless steel connecting pipe flange. The IPG fiber laser system has the laser frequency of 50kHz, the laser power of 80W, the spot diameter of 0.8mm, the scanning speed of 2mm/s and the scanning interval of 0.25mm.
And (3) testing: the Nano mechanical properties of the high pressure resistant stainless steel adapter flange were tested using an Agilent Nano INDENTER G Nano indenter, see table 1.
Comparative example 2
S1: cleaning the surface of the stainless steel connecting pipe flange with acetone for later use;
S2: adding 75% of cBN powder, 17% of TiN powder and 8% of aluminum powder into a hard alloy ball milling tank, and taking absolute ethyl alcohol as a ball milling medium, wherein the ball material mass ratio is 4:1, grinding and mixing materials for 6 hours, wherein the ball milling rotating speed is 300r/min, and vacuum drying for 8 hours at 100 ℃; and sintering the mixed powder for 10min at the pressure of 5.5GPa and the temperature of 1500 ℃ to obtain the polycrystalline cubic boron nitride.
S3: adding 0.5g of graphite fluoride into 120mL of concentrated sulfuric acid in an ice water bath state, uniformly stirring, adding 6g of potassium permanganate three times at intervals of 10min, slowly heating the ice water bath to 50 ℃ after stirring for 30min, and stirring for reaction for 8h; after the reaction is finished, adding hydrogen peroxide to remove unreacted complete potassium permanganate, and adding 10mL of 5% hydrochloric acid solution; adjusting the mixed solution to be neutral by deionized water, centrifuging at 5000r/min for 20min, collecting precipitate, placing the precipitate in deionized water, ultrasonically dispersing for 10min, centrifuging at 10000r/min for 1h, removing the precipitate, and freeze-drying the solution to obtain the fluorinated graphene.
S4: 12 parts of polycrystalline cubic boron nitride, 22 parts of modified Ni powder, 6 parts of fluorinated graphene and 1 part of polyvinylpyrrolidone are added into absolute ethyl alcohol, and the high-pressure-resistant coating solution is obtained through ultrasonic dispersion. Wherein the ultrasonic dispersion temperature is 80 ℃, the ultrasonic dispersion power is 240W, and the ultrasonic dispersion is repeated three times at intervals of 3min for 10 min.
S5: the high-pressure resistant coating solution is uniformly coated on the surface of the stainless steel bar connecting pipe flange, dried, placed in a transparent sealing box filled with nitrogen, and deposited by an IPG fiber laser system to obtain the high-pressure resistant stainless steel connecting pipe flange. The IPG fiber laser system has the laser frequency of 50kHz, the laser power of 80W, the spot diameter of 0.8mm, the scanning speed of 2mm/s and the scanning interval of 0.25mm.
And (3) testing: the Nano mechanical properties of the high pressure resistant stainless steel adapter flange were tested using an Agilent Nano INDENTER G Nano indenter, see table 1.
Comparative example 3
S1: cleaning the surface of the stainless steel connecting pipe flange with acetone for later use;
S2: adding 75% of cBN powder, 17% of TiN powder and 8% of aluminum powder into a hard alloy ball milling tank, and taking absolute ethyl alcohol as a ball milling medium, wherein the ball material mass ratio is 4:1, grinding and mixing materials for 6 hours, wherein the ball milling rotating speed is 300r/min, and vacuum drying for 8 hours at 100 ℃; and sintering the mixed powder for 10min at the pressure of 5.5GPa and the temperature of 1500 ℃ to obtain the polycrystalline cubic boron nitride.
S3: adding 8mL of polyethylene glycol into 100mL of nickel sulfate solution with the concentration of 0.05mol/L, and uniformly stirring; adding 100mL of hydrazine hydrate solution with the concentration of 0.125mol/L and 100mL of sodium hydroxide solution with the concentration of 0.175mol/L, carrying out ultrasonic reaction, and adjusting the pH value by using sodium hydroxide in the reaction process, and keeping the pH value unchanged until the reaction is finished; and (3) centrifuging, washing with absolute ethyl alcohol and deionized water for three times, and vacuum drying at 60 ℃ for 6 hours to obtain modified Ni powder.
S4: adding 0.5g of graphite fluoride into 120mL of concentrated sulfuric acid in an ice water bath state, uniformly stirring, adding 6g of potassium permanganate three times at intervals of 10min, slowly heating the ice water bath to 50 ℃ after stirring for 30min, and stirring for reaction for 8h; after the reaction is finished, adding hydrogen peroxide to remove unreacted complete potassium permanganate, and adding 10mL of 5% hydrochloric acid solution; adjusting the mixed solution to be neutral by deionized water, centrifuging at 5000r/min for 20min, collecting precipitate, placing the precipitate in deionized water, ultrasonically dispersing for 10min, centrifuging at 10000r/min for 1h, removing the precipitate, and freeze-drying the solution to obtain the fluorinated graphene.
S5: 12 parts of polycrystalline cubic boron nitride, 22 parts of modified Ni powder, 6 parts of fluorinated graphene and 1 part of polyvinylpyrrolidone are added into absolute ethyl alcohol, and the high-pressure-resistant coating solution is obtained through ultrasonic dispersion. Wherein the ultrasonic dispersion temperature is 80 ℃, the ultrasonic dispersion power is 240W, and the ultrasonic dispersion is repeated three times at intervals of 3min for 10 min.
S6: the high-pressure resistant coating solution is uniformly coated on the surface of the stainless steel bar connecting pipe flange, dried, placed in a transparent sealing box filled with nitrogen, and deposited by an IPG fiber laser system to obtain the high-pressure resistant stainless steel connecting pipe flange. The IPG fiber laser system has the laser frequency of 50kHz, the laser power of 80W, the spot diameter of 0.8mm, the scanning speed of 2mm/s and the scanning interval of 0.25mm.
And (3) testing: the Nano mechanical properties of the high pressure resistant stainless steel adapter flange were tested using an Agilent Nano INDENTER G Nano indenter, see table 1.
Comparative example 4
S1: cleaning the surface of the stainless steel connecting pipe flange with acetone for later use;
S2: adding 75% of cBN powder, 17% of TiN powder and 8% of aluminum powder into a hard alloy ball milling tank, and taking absolute ethyl alcohol as a ball milling medium, wherein the ball material mass ratio is 4:1, grinding and mixing materials for 6 hours, wherein the ball milling rotating speed is 300r/min, and vacuum drying for 8 hours at 100 ℃; and sintering the mixed powder for 10min at the pressure of 5.5GPa and the temperature of 1500 ℃ to obtain the polycrystalline cubic boron nitride.
S3: adding 8mL of polyethylene glycol into 100mL of nickel sulfate solution with the concentration of 0.05mol/L, and uniformly stirring; adding 100mL of hydrazine hydrate solution with the concentration of 0.125mol/L and 100mL of sodium hydroxide solution with the concentration of 0.175mol/L, carrying out ultrasonic reaction, and adjusting the pH value by using sodium hydroxide in the reaction process, and keeping the pH value unchanged until the reaction is finished; and (3) centrifuging, washing with absolute ethyl alcohol and deionized water for three times, and vacuum drying at 60 ℃ for 6 hours to obtain modified Ni powder.
S4: adding 0.5g of graphite fluoride into 120mL of concentrated sulfuric acid in an ice water bath state, uniformly stirring, adding 6g of potassium permanganate three times at intervals of 10min, slowly heating the ice water bath to 50 ℃ after stirring for 30min, and stirring for reaction for 8h; after the reaction is finished, adding hydrogen peroxide to remove unreacted complete potassium permanganate, and adding 10mL of 5% hydrochloric acid solution; adjusting the mixed solution to be neutral by deionized water, centrifuging at 5000r/min for 20min, collecting precipitate, placing the precipitate in deionized water, ultrasonically dispersing for 10min, centrifuging at 10000r/min for 1h, removing the precipitate, and freeze-drying the solution to obtain the fluorinated graphene.
S5: adding 12 parts of polycrystalline cubic boron nitride, 22 parts of modified Ni powder and 6 parts of fluorinated graphene into absolute ethyl alcohol, and performing ultrasonic dispersion to obtain a high-pressure-resistant coating solution. Wherein the ultrasonic dispersion temperature is 80 ℃, the ultrasonic dispersion power is 240W, and the ultrasonic dispersion is repeated three times at intervals of 3min for 10 min.
S6: the high-pressure resistant coating solution is uniformly coated on the surface of the stainless steel bar connecting pipe flange, dried, placed in a transparent sealing box filled with nitrogen, and deposited by an IPG fiber laser system to obtain the high-pressure resistant stainless steel connecting pipe flange. The IPG fiber laser system has the laser frequency of 50kHz, the laser power of 80W, the spot diameter of 0.8mm, the scanning speed of 2mm/s and the scanning interval of 0.25mm.
And (3) testing: the Nano mechanical properties of the high pressure resistant stainless steel adapter flange were tested using an Agilent Nano INDENTER G Nano indenter, see table 1.
Comparative example 5
S1: cleaning the surface of the stainless steel connecting pipe flange with acetone for later use;
S2: adding 75% of cBN powder, 17% of TiN powder and 8% of aluminum powder into a hard alloy ball milling tank, and taking absolute ethyl alcohol as a ball milling medium, wherein the ball material mass ratio is 4:1, grinding and mixing materials for 6 hours, wherein the ball milling rotating speed is 300r/min, and vacuum drying for 8 hours at 100 ℃; and sintering the mixed powder for 10min at the pressure of 5.5GPa and the temperature of 1500 ℃ to obtain the polycrystalline cubic boron nitride.
S3: adding 8mL of polyethylene glycol into 100mL of nickel sulfate solution with the concentration of 0.05mol/L, and uniformly stirring; adding 100mL of hydrazine hydrate solution with the concentration of 0.125mol/L and 100mL of sodium hydroxide solution with the concentration of 0.175mol/L, carrying out ultrasonic reaction, and adjusting the pH value by using sodium hydroxide in the reaction process, and keeping the pH value unchanged until the reaction is finished; and (3) centrifuging, washing with absolute ethyl alcohol and deionized water for three times, and vacuum drying at 60 ℃ for 6 hours to obtain modified Ni powder.
S4: adding 0.5g of graphite fluoride into 120mL of concentrated sulfuric acid in an ice water bath state, uniformly stirring, adding 6g of potassium permanganate three times at intervals of 10min, slowly heating the ice water bath to 50 ℃ after stirring for 30min, and stirring for reaction for 8h; after the reaction is finished, adding hydrogen peroxide to remove unreacted complete potassium permanganate, and adding 10mL of 5% hydrochloric acid solution; adjusting the mixed solution to be neutral by deionized water, centrifuging at 5000r/min for 20min, collecting precipitate, placing the precipitate in deionized water, ultrasonically dispersing for 10min, centrifuging at 10000r/min for 1h, removing the precipitate, and freeze-drying the solution to obtain the fluorinated graphene.
S5: 12 parts of polycrystalline cubic boron nitride, 22 parts of modified Ni powder, 6 parts of fluorinated graphene and 1 part of polyvinylpyrrolidone are added into absolute ethyl alcohol, and the high-pressure-resistant coating solution is obtained through ultrasonic dispersion. Wherein the ultrasonic dispersion temperature is 80 ℃, the ultrasonic dispersion power is 240W, and the ultrasonic dispersion is carried out for 30min.
S6: the high-pressure resistant coating solution is uniformly coated on the surface of the stainless steel bar connecting pipe flange, dried, placed in a transparent sealing box filled with nitrogen, and deposited by an IPG fiber laser system to obtain the high-pressure resistant stainless steel connecting pipe flange. The IPG fiber laser system has the laser frequency of 50kHz, the laser power of 80W, the spot diameter of 0.8mm, the scanning speed of 2mm/s and the scanning interval of 0.25mm.
And (3) testing: the Nano mechanical properties of the high pressure resistant stainless steel adapter flange were tested using an Agilent Nano INDENTER G Nano indenter, see table 1.
Comparative example 6
S1: cleaning the surface of the stainless steel connecting pipe flange with acetone for later use;
S2: adding 75% of cBN powder, 17% of TiN powder and 8% of aluminum powder into a hard alloy ball milling tank, and taking absolute ethyl alcohol as a ball milling medium, wherein the ball material mass ratio is 4:1, grinding and mixing materials for 6 hours, wherein the ball milling rotating speed is 300r/min, and vacuum drying for 8 hours at 100 ℃; and sintering the mixed powder for 10min at the pressure of 5.5GPa and the temperature of 1500 ℃ to obtain the polycrystalline cubic boron nitride.
S3: adding 8mL of polyethylene glycol into 100mL of nickel sulfate solution with the concentration of 0.05mol/L, and uniformly stirring; adding 100mL of hydrazine hydrate solution with the concentration of 0.125mol/L and 100mL of sodium hydroxide solution with the concentration of 0.175mol/L, carrying out ultrasonic reaction, and adjusting the pH value by using sodium hydroxide in the reaction process, and keeping the pH value unchanged until the reaction is finished; and (3) centrifuging, washing with absolute ethyl alcohol and deionized water for three times, and vacuum drying at 60 ℃ for 6 hours to obtain modified Ni powder.
S4: adding 0.5g of graphite fluoride into 120mL of concentrated sulfuric acid in an ice water bath state, uniformly stirring, adding 6g of potassium permanganate three times at intervals of 10min, slowly heating the ice water bath to 50 ℃ after stirring for 30min, and stirring for reaction for 8h; after the reaction is finished, adding hydrogen peroxide to remove unreacted complete potassium permanganate, and adding 10mL of 5% hydrochloric acid solution; adjusting the mixed solution to be neutral by deionized water, centrifuging at 5000r/min for 20min, collecting precipitate, placing the precipitate in deionized water, ultrasonically dispersing for 10min, centrifuging at 10000r/min for 1h, removing the precipitate, and freeze-drying the solution to obtain the fluorinated graphene.
S5: 12 parts of polycrystalline cubic boron nitride, 22 parts of modified Ni powder, 6 parts of fluorinated graphene and 1 part of polyvinylpyrrolidone are added into absolute ethyl alcohol, and the high-pressure-resistant coating solution is obtained through ultrasonic dispersion. Wherein the ultrasonic dispersion temperature is 80 ℃, the ultrasonic dispersion power is 400W, and the ultrasonic dispersion is repeated three times at intervals of 3min for 10 min.
S6: the high-pressure resistant coating solution is uniformly coated on the surface of the stainless steel bar connecting pipe flange, dried, placed in a transparent sealing box filled with nitrogen, and deposited by an IPG fiber laser system to obtain the high-pressure resistant stainless steel connecting pipe flange. The IPG fiber laser system has the laser frequency of 50kHz, the laser power of 80W, the spot diameter of 0.8mm, the scanning speed of 2mm/s and the scanning interval of 0.25mm.
And (3) testing: the Nano mechanical properties of the high pressure resistant stainless steel adapter flange were tested using an Agilent Nano INDENTER G Nano indenter, see table 1.
The following data are the elastic modulus and the elastic hardness at 1000nm
TABLE 1 nanometer mechanical Properties
The use of cubic boron nitride for preparing the high pressure resistant coating solution in comparative example 1 resulted in a decrease in elastic modulus and hardness, resulting in a decrease in high pressure resistance of the stainless steel adapter flange. The reason for this is that polycrystalline cubic nitriding has stronger high pressure resistance and wear resistance.
The use of Ni powder for the preparation of the high pressure resistant coating solution in comparative example 2 resulted in a decrease in elastic modulus and hardness, resulting in a decrease in high pressure resistance of the stainless steel adapter flange. The reason is that the modified Ni powder has better dispersibility and can avoid the occurrence of agglomeration.
The preparation of the high pressure resistant coating solution using graphene in comparative example 3 resulted in a decrease in elastic modulus and elastic hardness, resulting in a decrease in high pressure resistance of the stainless steel adapter flange. The reason is that the fluorinated graphene has lower surface energy and stronger hydrophobicity, and also has better high-temperature resistance, high-pressure resistance and stable chemical property.
The importance of the synergistic effect of the added polycrystalline cubic boron nitride, the modified Ni powder and the fluorinated graphene can be seen from comparative examples 1-3. In the laser cladding process, as the lap joint cladding track is continuously generated on the surface of the stainless steel connecting pipe flange by laser, the solidification speed is delayed by the high temperature resistance of the fluorinated graphene, the mutual solution balance of liquid phase and solid phase in the cladding system is improved, the coating stress concentration in the cladding system is reduced, and the formation of coating cracks is further inhibited.
The addition of TiN and Al in the polycrystalline cubic boron nitride enriches the phases in a deposition system, and TiC, tiB, ti 2 Ni and alpha-Ti are additionally contained in the deposition system. The TiC is used as a hard phase to coat the fluorinated graphene particles, so that a lubricating phase in the coating can be effectively increased, and in the high-pressure extrusion process, the TiC can form a drag and drag effect on the fluorinated graphene, so that the phenomenon of cracking of the coating caused by collective falling of the fluorinated graphene from the coating is prevented; meanwhile, tiC and Ti 2 Ni form a composite structural phase which is staggered and grows in an adhering way, so that Ti 2 Ni tissues can be thinned, the distribution uniformity of the Ti 2 Ni tissues is improved, the occurrence of agglomeration phenomenon is avoided, the cracking sensitivity of the coating is reduced, the stability under high pressure is facilitated, and the fluctuation of the mechanical property of the coating is reduced.
The absence of polyvinylpyrrolidone in comparative example 4 resulted in a decrease in the modulus of elasticity and the hardness of elasticity, resulting in a decrease in the high pressure resistance of the stainless steel adapter flange. The reason is that the polyvinylpyrrolidone has a longer hydrocarbon chain structure, can be adsorbed on the surface of the powder to have a dispersing effect, greatly enhances the rejection performance among particles, can enhance the electric double layer rejection performance among particles, the hydration film action and the steric hindrance rejection performance by adding the polyvinylpyrrolidone as a dispersing agent, and effectively solves the problem that uneven distribution of each component in the high-pressure-resistant coating solution is caused by mutual agglomeration among the particles, so that the high-pressure-resistant performance of the coating is poor.
The absence of the use of the alternate ultrasonic dispersion solution in comparative example 5 resulted in a decrease in the modulus of elasticity and the hardness of elasticity, resulting in a decrease in the high pressure resistance of the stainless steel adapter flange. The long-time ultrasonic treatment can cause re-agglomeration of particles, and along with the increase of ultrasonic time, heat energy and mechanical energy generated in the ultrasonic process can be accumulated continuously, so that the particles move in resonance, the probability of collision among the particles is increased, and the particles are re-agglomerated.
In comparative example 6, too high an ultrasonic frequency was used to disperse the solution, resulting in a decrease in elastic modulus and elastic hardness, and a decrease in high pressure resistance of the stainless steel adapter flange. Too much power, resulting in too high energy, promotes molecular movement and agglomeration between particles.
Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The manufacturing process of the high-pressure-resistant stainless steel connecting pipe flange is characterized by comprising the following steps of:
S1: pretreating the surface of a stainless steel connecting pipe flange for later use;
S2: coating the high-pressure-resistant coating solution on the surface of the stainless steel bar connecting pipe flange, drying, and cladding by using an IPG fiber laser system under the protection of nitrogen to obtain the high-pressure-resistant stainless steel connecting pipe flange;
in step S2, the high pressure resistant coating solution composition includes: polycrystalline cubic boron nitride, modified Ni powder, fluorinated graphene, polyvinylpyrrolidone and absolute ethyl alcohol;
In step S2, the high pressure resistant coating solution is prepared as follows: adding polycrystalline cubic boron nitride, modified Ni powder, fluorinated graphene and polyvinylpyrrolidone into absolute ethyl alcohol, and performing ultrasonic dispersion;
The ultrasonic dispersion temperature is 75-80 ℃, the ultrasonic dispersion power is 220-240W, each ultrasonic dispersion is carried out for 10min at intervals of 3min, and the process is repeated for three times;
The modified Ni powder is prepared according to the following method: adding 8mL of polyethylene glycol into 100mL of nickel sulfate solution with the concentration of 0.05mol/L, and uniformly stirring; adding 100mL of hydrazine hydrate solution with the concentration of 0.125mol/L and 100mL of sodium hydroxide solution with the concentration of 0.175mol/L, carrying out ultrasonic reaction, and adjusting the pH value by using sodium hydroxide in the reaction process, and keeping the pH value unchanged until the reaction is finished; centrifuging, washing with absolute ethanol and deionized water for three times, and vacuum drying.
2. The process for manufacturing the high-pressure-resistant stainless steel adapter flange according to claim 1, wherein the process comprises the following steps of: every 100 parts of high-pressure-resistant coating solution comprises 4-12 parts of polycrystalline cubic boron nitride, 18-22 parts of modified Ni powder, 5-6 parts of fluorinated graphene, 1-2 parts of polyvinylpyrrolidone and the balance of absolute ethyl alcohol.
3. The process for manufacturing the high-pressure-resistant stainless steel adapter flange according to claim 1, wherein the process comprises the following steps of: the polycrystalline cubic boron nitride is prepared by the following steps: adding 75% of cBN powder, 17% of TiN powder and 8% of aluminum powder into a hard alloy ball milling tank, and taking absolute ethyl alcohol as a ball milling medium, wherein the ball material mass ratio is 4:1, grinding, vacuum drying, and sintering for 10min at the pressure of 5.5GPa and the temperature of 1500 ℃.
4. The process for manufacturing the high-pressure-resistant stainless steel adapter flange according to claim 1, wherein the process comprises the following steps of: the fluorinated graphene is prepared according to the following method: adding 0.5g of graphite fluoride into 120mL of concentrated sulfuric acid in a state of ice water bath at 0-2 ℃, uniformly stirring, adding 6g of potassium permanganate three times, stirring for 30min at a time interval of 10min, slowly heating the ice water bath at 0-2 ℃ to 50 ℃, and stirring for reaction; after the reaction is finished, removing unreacted complete potassium permanganate, regulating the mixed solution to be neutral, centrifuging, collecting precipitate, placing the precipitate into deionized water, centrifuging after ultrasonic dispersion, removing the precipitate, and freeze-drying the solution.
5. The process for manufacturing the high-pressure-resistant stainless steel adapter flange according to claim 1, wherein the process comprises the following steps of: the laser frequency of the IPG fiber laser system is 50kHz, the laser power is 80W, the diameter of a light spot is 0.8mm, the scanning speed is 2mm/s, and the scanning interval is 0.25mm.
6. A high pressure resistant stainless steel take over flange made by the process of manufacturing a high pressure resistant stainless steel take over flange according to any one of claims 1-5.
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